21828761807 has 2 divisors, whose sum is σ = 21828761808. Its totient is φ = 21828761806.

The previous prime is 21828761803. The next prime is 21828761831. The reversal of 21828761807 is 70816782812.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21828761807 - 2² = 21828761803 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21828761803) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10914380903 + 10914380904.

It is an arithmetic number, because the mean of its divisors is an integer number (10914380904).

Almost surely, 2^21828761807 is an apocalyptic number.

21828761807 is a deficient number, since it is larger than the sum of its proper divisors (1).

21828761807 is an equidigital number, since it uses as much as digits as its factorization.

21828761807 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 602112, while the sum is 50.

The spelling of 21828761807 in words is "twenty-one billion, eight hundred twenty-eight million, seven hundred sixty-one thousand, eight hundred seven".